This is an interesting model for me, but I have to change:
BMS 4550 to BMS 4555, because second one is available. The features look like completely the same, that's why it doesn't matter, I think.
RCF HF64 to BMS 2236, same reason as previous. First one is complicated to buy for me, but possible.
This horn is a little bit strange for mount, because this is larger than rcf hf64. Width: 498mm (mounting plate looks little bit larger than 500mm on the plan - it fits), height: 348mm - too large. May I resize a bit this part or I have to use rcf hf64 every way?
I have to built a crossover also. Which frequency is recommended?